I do this style of shot on a Bonzini with the yellow composite ITSF balls, and have found success in doing so. You can generate a massive amount of speed when you do this correctly.
Using a typical iPhone, I estimate the speed of the ball to be around 15mph based on framerate and distance traveled.
While I'm not proficient on a Tornado, I've also shot this shot on a Tornado and it's much faster than the Bonzini.
Like any shot, it takes a lot of practice to get efficient with, but it's much less of a gimmick shot than those who do not shoot it would like to believe.